The next part of my journey to discover USB power nirvana. I tried to take the IC-705 out with the USB trigger cable and a power bank, but discovered to my dismay that the 5.5 mm barrel connector didn't fit. Turns out that 5.5mm barrel connectors come in two variants. One with an inner diameter of 2.1mm and the other with an inner diameter of 2.5mm. Luckily I also have a few "USB trigger PCBs". So today you get to join me as I create my own USB trigger cable with a 5.5 x 2.5mm barrel jack. And with properly sized cable as well.